Best place to hook up a vacuum gauge

I tried one of the ports off the base of the carb and the vac seems a bit low, My the port on the carb is where you want to hook up your gauge.
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I got a pretty steady reading of Everything sounded great and the carb responded good. Did not make it to the lake for a load test but will do tonight. How would you condider the reading of 16 at rpm? Just hook that pup up and turn the motor on at least thats what I do.

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In fact, I have my gauge hooked up permanently in my truck. I think its the best way to tell what your engine is actually doing. You can start to adjust your idle mixture screws, timing, etc, to see what it does to the readings.


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I like to have the idle set around rpm or so to get a solid reading. If you rev the motor up, the readings will go up. I am interested in seeing what types of readings Eric likes to see, and what rpm range. He knows A LOT more than the internet!! In fact, I think he invented the internet. No wait, that was Al Gore. Alan, I see that in your pic you just have a cap on the brass fitting. Can you run like that? Do you leave that fitting in there all the time?

Davidg, Do you leave your fitting in or do you plan to? Check this link out guys. A good overview on vacuum readings. I don't think 16" is a bad reading. I would be happy with that. Has your engine ever been rebuilt? What kind of top speed do you get on your boat? Last year, I was getting readings of 12 or 13, and then engine seemed to run good. I was just not as fast as I would like to have seen it. It also leaked oil from the rear main seal.

I have it up to around 15" in the driveway. Once I get the intake remmounted, I am hoping for better. Thats just an automotive vacuum plug from any parts store, it runs like that and the fitting stays in permanently. David, Yes it has been rebuilt about hrs ago.


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      • Mark Channels Read Calendar. Where exactly do you hook up a vacuum gauge to check cylinders, and also to adjust idle mixture? I know its suppose to be hooked up to the manifold, but where? August 14th, , Better safe than sorry in this case. Glad to hear your back on the water!! Are you trying to track down that hesitation issue after the carb re-build?

      Instaling a Vacuum Gauge to Monitor Motor Health

      Just a side note I soaked my carb 3 x and washed it with soapy water between each soak before re-assembly. Also if your looking for some sort of vacum leak try a bottle of water while running the engine and spray it on various conection locations around the engine and if it stumbbles ther it is. PCV hose, could be reduced to fit. I have put an arrow to the plug you should remove. You should be able to get a fitting with a barb from any reasonable hardware shop. You can find an inexpensive, aftermarket manual for your vehicle at most auto parts stores or online.

      Another possible source is the reference section of your local public library. A vacuum gauge will help you find the source of your car mechanical problems at a low cost and within a few minutes. It'll guide you to specific systems and components for further testing, when necessary. Remember that you can continue your troubleshooting procedure with the help of the vehicle service manual for your particular car make and model.

      Today, the vacuum gauge has been replaced by newer technology as one of the primary tools in a shop. But don't underestimate its effectiveness. The vacuum gauge still remains a reliable tool for many shops and DIYers that know how to take advantage of it. And you should too. Haynes offers the best coverage for cars, trucks, vans, SUVs and motorcycles on the market today.

      Each manual contains easy to follow step-by-step instructions linked to hundreds of photographs and illustrations. Included in every manual: Content is for informational or entertainment purposes only and does not substitute for personal counsel or professional advice in business, financial, legal, or technical matters. Sign in or sign up and post using a HubPages Network account. Comments are not for promoting your articles or other sites. Other product and company names shown may be trademarks of their respective owners.

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      How to hook up vacuum gage? - arraya.co Forums

      Please choose which areas of our service you consent to our doing so. For more information on managing or withdrawing consents and how we handle data, visit our Privacy Policy at: How Engine Vacuum Works If we think of vacuum as the absence of air, this is what happens more or less inside your car engine when running. Mechanical and System Problems Affecting Vacuum To operate properly, an internal combustion engine needs a relatively sealed environment where to create and control vacuum.

      Preparing for a Vacuum Gauge Reading Test Before you begin your diagnostic, you should know that even a trained car technician may misread a gauge during a test. The Vacuum Test 1.

      Mechanical and System Problems Affecting Vacuum

      Find Your Vehicle Repair Manual. Test Your Knowledge of Engine Vacuum. Questions must be on-topic, written with proper grammar usage, and understandable to a wide audience. This website uses cookies As a user in the EEA, your approval is needed on a few things.

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      Where to hook up vacuum gauge?

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